Any idea which is the best host to recommend as an affiliate?

The qualities I look for are:
* cheap, high-quality hosting with no big complaints published to the web, only praise
* LAMP - based servers
* perfect tracking of affiliate generated sales

I recommend Host Gator which I mostly use but only got 1 sale commission in about 2 years, so I wonder about if they are tracking my referrals correctly. I wouldn't be happy to recommend any hosting that I don't personally use.

I could resell hosting but the customer support issue is off-putting.

That might prove hard to find, expecially on a decently sized company, and especially if you're after the ones that pay good commissions.
You can always join their affiliate program via CJ.com. That way a third party would be handling the tracking.

I second the notion that you may have trouble finding any company that only has been praised online and has no bad comments said about them, anywhere.

People complain more often than they voice their appreciation for something. Part of it's human nature, part of it's that hosting is a service. It should just work. When it doesn't work, then (obviously) people speak up.

You may find the opposite when something is one of a kind (think Prius, in its early days) or has developed a "cult-of-brand" around it. (Then you run into the evangelists, which don't exactly provide a balanced perspective...but that's another story.)

Are you looking for an affiliate program with a service that you use, or just an affiliate program that anyone can join - you don't have to be a customer?